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Study of Pentaquark Baryons uainp String Theories

Research Project

Project/Area Number 17540238
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionOchanomizu University

Principal Investigator

SUGAMOTO Akio  Ochanomizu University, Graduate School of Humanities and Sciences, Professor (70132686)

Co-Investigator(Kenkyū-buntansha) BANDO Masako  Aichi U, Department of Law, Professor (20025365)
KUGO Taichi  Kyoto U., Yukawa Institute for Fundamental Research, Professor (00115833)
CHO Gi-chol  Ochanomizu U., Graduate School of Humanities and Sciences, Associate Professor (10323859)
IMAMURA Yosuke  Tokyo U., Graduate School of Sciences, Assistant Professor (80323492)
小原 みどり  お茶の水女子大学, 人間文化研究科, 助手 (00361816)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsPentaquarks / Superstrings / Dual Gravity Theory / ペンタフォーク / 双対動力理論 / ジャンクション
Research Abstract

This research project is to study the lightness of the mass and the smallness of the decay width of Pentaquark baryons found in 2003 at Spring-8. Energy of string junctions existing in the string model of Pentaquarks is estimated, using a QCD-like string theory. The negative value for the junction energy is obtained. Therefore, increasing the number of junctions, we may have a fullerene-like objects having strings and junctions. In the study of the shape of mesons and of the potential between quarks, we have found that the shape of string is changed depending on its length. At a certain length the potential between quarks is found to have a point of inflection. Hence the potential inside the hadronic matter becomes deep if heavy flavor is included, so that we may understand the phenomenon of such a hadronic matter being more dense.
Introduction of spin into hadrons in string theory is studied using two dimensional non-linear sigma model. We have found that the more than 60% of the spin of hadron is distributed in the middle part of the string, and so the result may explain the spin crisis. The kinetic term of string is necessary in evaluating the mass and the decay width of hadrons. The method to include this term is studied using the string field theory and the WKB approximation. The mass of glueballs is studied using the duality between the non-commutative gauge theory and the gravity. Using the Bars-Hanson string model in which the fields are placed at both ends of an open string, the non-Abelian Born-Infeld action, the effective action of string, is derived naturally.

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (21 results)

All 2008 2007 2006 Other

All Journal Article (16 results) (of which Peer Reviewed: 2 results) Presentation (5 results)

  • [Journal Article] Can the Baryoin number density and the cosmological constant be interrelated?2008

    • Author(s)
      A. Minamizaki and A. Sugamoto
    • Journal Title

      Phys. Lett. B 659

      Pages: 656-660

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Baryogenesis by Quantum Gravity.2008

    • Author(s)
      K. Hamada, A. Minamizaki, and A. Sugamoto
    • Journal Title

      Mod. Phys. Left. A 23

      Pages: 237-244

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An exotic approach to hadron phys2007

    • Author(s)
      M. Bando, Y. Fukase, J. Shock, A. Sugamoto andS. Terunuma
    • Journal Title

      Prog. Theor. Phys. Suppl. 168

      Pages: 223-223

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] An exotic approach to hadron physics2007

    • Author(s)
      M. Bando, Y. Fukase, J. Shock, A. Sugamoto, S. Terunuma
    • Journal Title

      Prog. Theor. Phys 168(Suppl)

      Pages: 223-223

    • NAID

      110006473414

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Meson strings and flavor branes2006

    • Author(s)
      M. Bando, A. Sugamoto and S. Terunuma
    • Journal Title

      Prog. Theor. Phys 115

      Pages: 1111-1111

    • NAID

      110004759548

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Baryon vertices in AdS blackhole backgrounds2006

    • Author(s)
      Y. 〜Imamura
    • Journal Title

      Prog. Theor. Phys. 115

      Pages: 815-815

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Meson strings and flavor branes2006

    • Author(s)
      M. Bando, A. Sugamoto, S. Terunuma
    • Journal Title

      Prog. Theor. Phys 115

      Pages: 1111-1111

    • NAID

      110004759548

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Baryon vertices in AdS blackhole backgrounds2006

    • Author(s)
      Y.〜Imamura
    • Journal Title

      Prog. Theor. Phys 115

      Pages: 815-815

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Glueball mass spectra for supergravit duals of noncommutative gauge theories2006

    • Author(s)
      T. Nakajima, K. Suzuki, H. Takahashi
    • Journal Title

      JHEP 0601

      Pages: 16-16

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Megon strings and flavor branes2006

    • Author(s)
      M.Bando, A.Sugamoto, S.Terauchi
    • Journal Title

      Prog.Theon Phys. 115

      Pages: 1111-1111

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Weak boson fusion production of supersymmetric particles at the LHC2006

    • Author(s)
      G.C.Cho 他5名
    • Journal Title

      Phys.Rev.D 73

      Pages: 54002-54002

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Global symmetries au't Hooft anomalies in brane tilting2006

    • Author(s)
      Y.Imamura
    • Journal Title

      JHEP 0612

      Pages: 41-41

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Anomaly cancellations in brane tilting2006

    • Author(s)
      Y.Imamura
    • Journal Title

      JHEP 0606

      Pages: 11-11

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Baryon vertices in AdS blackhole backgrounds2006

    • Author(s)
      Y.Imamura
    • Journal Title

      Pros.Theor.Phys. 115

      Pages: 815-815

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Baryon vertices in AdS blackhole backgrounds

    • Author(s)
      今村 洋介
    • Journal Title

      preprint hep-th/0512314 (採択決定)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Meson Strings and Flavor Branes

    • Author(s)
      坂東昌子, 菅本晶夫, 照沼幸子
    • Journal Title

      preprint hep-ph/0602203 (採択決定)

    • NAID

      110004759548

    • Related Report
      2005 Annual Research Report
  • [Presentation] Hadron Mass Spectroscopy bu Spinning Strings2006

    • Author(s)
      S. Terunuma, M. Bando, A. Sugamoto
    • Organizer
      Poster presentation at Joint Meeting of Pacific Region Particle Physics Communities
    • Place of Presentation
      Honolulu, Hawaii
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Leptogenesis at the TeV scale in Brane World Cosmology2006

    • Author(s)
      K., Kanehata, G.-C., Cho, A., Sugamoto
    • Organizer
      Oral Talk at Joint Meeting of Pacific Particle Physics Communities
    • Place of Presentation
      Hawaii
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Two Small Numbers : Baryon number and the Cosmologocal Constant, Are they interrelated?2006

    • Author(s)
      Minamizki, A., Sugamoto
    • Organizer
      Oral Talk at Joint Meeting of Pacific Particle Physics Communities
    • Place of Presentation
      Hawaii
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Hadron Mass Spectroscopy bu Spinning Strings, Communities2006

    • Author(s)
      S., Terunuma, M., Bando, A., Sugamoto
    • Organizer
      Poster presentation at Joint Meeting of Pacific Region Particle Physics
    • Place of Presentation
      Hawaii
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Mass Spectrum of Mesons in Second Quantized Dual String Model of QCD, Communities2006

    • Author(s)
      Y., Fukase, M., Bando, J., Shock, A., Sugamoto
    • Organizer
      Poster presentation at Joint Meeting of Pacific Region Particle Physics
    • Place of Presentation
      Hawaii
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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